[exim] maildir_quota_directory_regex with subfolders

Hello,

the docu says, that this is the default:

maildir_quota_directory_regex = ^(?:cur|new|\..*)$

But on our server it seems, that subfolders beginning with a dot aren't
included. Does exim look into sub-subfolders? We have folders like this

cur
new
.Junk/cur
.Junk/new
.Trash/cur
.Trash/new

and so on and we have a lot of mailboxes, that are far above their limit.

Regards
Marten